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<ul>
  <li><a href="./Class::DOES.html#NAME">NAME</a></li>
  <li><a href="./Class::DOES.html#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="./Class::DOES.html#DESCRIPTION">DESCRIPTION</a>
    <ul>
      <li><a href="./Class::DOES.html#Setting-%25DOES-directly.">Setting %DOES directly.</a></li>
      <li><a href="./Class::DOES.html#DIAGNOSTICS">DIAGNOSTICS</a></li>
    </ul>
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  <li><a href="./Class::DOES.html#AUTHOR">AUTHOR</a></li>
  <li><a href="./Class::DOES.html#BUGS">BUGS</a></li>
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<div class="pod anchors">
<h1 id="NAME">NAME</h1>

<p>Class::DOES - Provide a simple -&gt;DOES override</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>    package My::Class;

    use Class::DOES qw/Some::Role/;

    if (My::Class-&gt;DOES(&quot;Some::Role&quot;)) {
        #...
    }</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>Perl 5.10 introduced a new method in <a href="https://metacpan.org/pod/UNIVERSAL">UNIVERSAL</a>: <code>DOES</code>. This was added to support the concept of <b>roles</b>. A role is an interface (a set of methods, with associated semantics) that a class or an object can implement, without necessarily inheriting from it. A class declares that it implements a given role by overriding the <code>-&gt;DOES</code> method to return true when passed the name of the role.</p>

<p>This is all well and flexible, allowing advanced object systems like <a href="Moose.html">Moose</a> to implement the <code>-&gt;DOES</code> override as they see fit, but what about ordinary classes that just want to declare they support a known interface? That&#39;s what this module is for: you pass it a list of roles on the <code>use</code> line, and it gives you a <code>-&gt;DOES</code> override that returns true for</p>

<dl>

<dt id="-any-role-in-the-supplied-list;"><a id="any-role-in-the-supplied-list"></a>- any role in the supplied list;</dt>
<dd>

</dd>
<dt id="-any-class-you-inherit-from;"><a id="any-class-you-inherit-from"></a>- any class you inherit from;</dt>
<dd>

</dd>
<dt id="-any-role-supported-by-any-class-you-inherit-from."><a id="any-role-supported-by-any-class-you-inherit-from"></a>- any role supported by any class you inherit from.</dt>
<dd>

</dd>
</dl>

<p>It makes the following assumptions:</p>

<dl>

<dt id="-All-your-inheritance-happens-through-@ISA."><a id="All-your-inheritance-happens-through--ISA"></a>- All your inheritance happens through <code>@ISA</code>.</dt>
<dd>

<p>That is, you haven&#39;t overridden <code>-&gt;isa</code>.</p>

</dd>
<dt id="-Noone-else-has-given-you-a-&gt;DOES-method."><a id="Noone-else-has-given-you-a--DOES-method"></a>- Noone else has given you a <code>-&gt;DOES</code> method.</dt>
<dd>

<p>That is, none of your superclasses have their own <code>-&gt;DOES</code> override (other than one provided by this module).</p>

</dd>
</dl>

<p>If it detects either of these at <code>use</code> time, it will issue a warning.</p>

<h2 id="Setting-%DOES-directly."><a id="Setting"></a><a id="Setting--DOES-directly"></a>Setting <code>%DOES</code> directly.</h2>

<p>This module stores the roles you support in the <code>%DOES</code> hash in your package. If you want <code>-&gt;DOES</code> to return something other that <code>1</code> for a role you support, you can make an entry in your <code>%DOES</code> hash yourself and it will be picked up.</p>

<p>You should not make entries with false values, as this would be very confusing. If you do, then when <code>-&gt;DOES</code> is called it will return <code>1</code> instead of the given value, and will issue a warning.</p>

<h2 id="DIAGNOSTICS">DIAGNOSTICS</h2>

<p>All of these can be disabled with</p>

<pre><code>    no warnings &quot;Class::DOES&quot;;</code></pre>

<dl>

<dt id="%s-has-inherited-an-incompatible-&gt;DOES"><a id="s-has-inherited-an-incompatible--DOES"></a>%s has inherited an incompatible -&gt;DOES</dt>
<dd>

<p>You have issued <code>use Class::DOES</code> from a class that already has a <code>-&gt;DOES</code> method. This inherited method will be completely ignored, so any roles it claims to support will be lost.</p>

</dd>
<dt id="%s-doesn&#39;t-use-@ISA-for-inheritance"><a id="s-doesn-t-use--ISA-for-inheritance"></a>%s doesn&#39;t use @ISA for inheritance</dt>
<dd>

<p>You have issued <code>use Class::DOES</code> from a class with an overriden <code>-&gt;isa</code>. Since the exported <code>-&gt;DOES</code> method uses <code>@ISA</code> to determine inheritance, any extra classes <code>-&gt;isa</code> claims to inherit from will not be checked for the requested role.</p>

</dd>
<dt id="$%s::DOES{%s}-is-false,-returning-1"><a id="s::DOES-s--is-false--returning-1"></a>$%s::DOES{%s} is false, returning 1</dt>
<dd>

<p><code>-&gt;DOES</code> has found a false entry in a <code>%DOES</code> hash, and is returning <code>1</code> instead to indicate the role is supported.</p>

</dd>
</dl>

<h1 id="AUTHOR">AUTHOR</h1>

<p>Copyright 2009 Ben Morrow &lt;ben@morrow.me.uk&gt;.</p>

<p>This program is licensed under the same terms as Perl.</p>

<h1 id="BUGS">BUGS</h1>

<p>Please send bug reports to &lt;bug-Class-DOES@rt.cpan.org&gt;.</p></div>

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        <pre><code>cpanm Class::DOES</code></pre>
        <p><a href="https://metacpan.org/pod/CPAN">CPAN shell</a></p>
        <pre><code>perl -MCPAN -e shell
install Class::DOES</code></pre>
        <p>For more information on module installation, please visit <a href="https://www.cpan.org/modules/INSTALL.html">the detailed CPAN module installation guide</a>.</p>
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